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The configuration item core.sharedrepository used to be a boolean, and
backward compatibility is highly valued with the Git developers. So
that explains the umask/false and group/true values.

The everybody value is a suggestion by Linus, after which Junio
anticipated a request for world, and in the eventual commit
(94df2506edd), Junio has thrown in all, probably for good measure:-)

Having the possibility to specify an option, even if it is the default
does not seem silly to me, as it can serve very usefully as
documentation in scripts and configuration files.

In my experience, the silliness of code or features diminishes when you know a little bit more about
how it came to be. This, of course, does not mean that there is not an awful lot of silly code and features
out there:-)

Having the possibility to specify an option, even if it is the default does not seem silly to me

It doesn't to me, by itself. It starts to seem silly though when there's seven values you can specify with only three meanings, and two of those values simply specify the default.

Having a little more context now, it still seems like a bad design decision to me that they "anticipated" world, and "threw in" all for good measure, because at the moment, if I'm understanding the docs correctly, those two options have exactly the same semantics as "everybody."

--J. David works really hard, has a passion for writing good software, and knows many of the world's best Perl programmers

Probably. But still, that particular piece of code hasn't changed since June 2006.
Is it silly? Yes. Is it important? No. Also, not being able to have all
and world mean something other for the core.sharedrepository
configuration item doesn't seem like a big loss to me. How would all mean
something different than world in the context of Unix file permissions?